Gayatri - Add backend for Job Analytics device-specific engagement metrics (Ticket #34) - #2332
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…agement metrics (sessions, bounce rate, avg engagement time)
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Description
Adds the missing backend endpoint for Ticket #34 (Job Analytics Page - Add Device-Specific Engagement Metrics). This is the companion backend for frontend PR #4998, which currently uses mock data.
New Endpoint
GET /api/applicant-analytics/device-breakdown?startDate=YYYY-MM-DD&endDate=YYYY-MM-DDReturns real, computed per-device engagement metrics from the existing
AnonymousInteractioncollection:Response shape matches exactly what the frontend's
generateMockAnalyticsData().deviceBreakdownalready expects, so wiring it in should be a drop-in replacement of the mock.Related PR
Frontend: #4998 (needs this backend, per its own description: "This frontend PR is not related to any backend PR")
How to test
npm installandnpm run devcurl -H "Authorization: <token>" "http://localhost:4500/api/applicant-analytics/device-breakdown?startDate=2025-08-01&endDate=2025-08-31"Testing
Added 7 new unit tests covering: permission checks, date validation, the core aggregation math (verified against hand-calculated expected values), no-data edge case, and error handling. All existing tests (150/151 suites) and lint pass — the one pre-existing failure (
reasonSchedulingController) is a local MongoDB timeout unrelated to this change.Also manually verified live against the dev database — confirmed real session/bounce-rate/engagement-time data is correctly aggregated and returned.